Smog inspection station · Vallejo, CA · reviewed since 2016
iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%34+21.6Reliability 28%2+0.6Replies to reviews 8%100+8.2Craft & service penalty91−0.9Momentum penalty0−10Experts Score= 20Not enough data for value; its weight is shared by the others.Grade D: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.20SCORE
DGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#35 of 35 well inspectorsiPosition by Experts Score among all companies we track in this category. · better than 0%
4.6★★★★★253 Google reviews · 24 photos
81%five-star reviews
3.79★last 12 monthsiAverage stars on reviews from the last 12 months only.
25%1–2★ in 2 yearsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
Google reviewers rate SG Smog Check Center 4.6 out of 5 based on 253 reviews, noting that the owner responds to 96% of feedback. Customers frequently praise the station for quick service, reasonable pricing with available coupons, and professional staff who efficiently handle smog inspections. However, recurring criticisms in low-star reviews highlight instances of perceived rudeness, inconsistent scheduling policies, and disputes over failed inspection results where vehicles subsequently passed at other facilities.
Google rating: 4.6 out of 5 from 253 reviews (81% five-star).
Reviews on this page: 253 Google reviews (169 with written comments, 3 with photos).
Owner responses: the business replied to 96% of reviews.
Most recent review: October 17, 2026.
Service: Well Inspector serving Vallejo, California.
Data from Google, last updated October 26, 2026.
Score profile vs other well inspectors
Score per factor (100 = best)iEach factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: replies to reviews and craft & service; weakest: momentum.
SG SMOG CHECK CENTERWell Inspectors median0 = centre, 100 = best
SatisfactioniSatisfaction · 54% of the scoreRecency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.SG SMOG CHECK CENTER: 34/100 on this factor. Category median: 90.D
34
ReliabilityiReliability · 24% of the scoreHow rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.SG SMOG CHECK CENTER: 2/100 on this factor. Category median: 88.F
2
Craft & serviceiCraft & service · penalty only, up to −10 pointsGoogle review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.SG SMOG CHECK CENTER: 91/100 on this factor. Category median: 97.A
91
ValueiValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Not enough reviews for this factor yet. Category median: 100.–
–
MomentumiMomentum · penalty only, up to −10 pointsPenalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.SG SMOG CHECK CENTER: 0/100 on this factor. Category median: 100.F
0
Replies to reviewsiReplies to reviews · 7% of the scoreHow often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.SG SMOG CHECK CENTER: 100/100 on this factor. Category median: 82.A
100
Bar = this company · dark tick = category median.
Star ratings
253 Google reviews we collected
4.6of 5
5 stars20681%
4 stars2610%
3 stars52%
2 stars10%
1 star156%
Praise vs complaints
Phrases our text analysis found in 169 written reviews
94%praise
Praise21694%
Complaints156%
Topic share
How often each topic comes up in the written reviews
7topics
Speed & response8637%
Staff & attitude7432%
Price & value3013%
Quality & results209%
Would recommend167%
Honesty & trust42%
Communication10%
What customers talk about
We read 169 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Very professional, quick and easy to understand, great service”
“They always have such kind people working there was well!”
“…he day, so I went there on the 24/may/26 ,well before closing and was rudely told to come back tomorrow because it was too late in the day, I don’t th…”
“There cost is reasonable and they make every effort to get you in and out.”
“I hate businesses that try to rip off working people.”
“…once again, they quoted me the best price over the phone and really exceeded my expectations.…”
“the customer service is horrible it was a hot day and they told me not to go inside the waiting area to stay outside in the hot sun.”
“I highly recommend them and will be urging all of my loved ones to get their smog check done here.”
“Stay away from this clowns, I call in to see if they can help me, they say yes, once I arrived they say they can't because they are too busy.”
“The best part is they are honest.”
“They are not trustworthy.”
“Very easy to work with.”
People customers mention
Sundays4 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired SG SMOG CHECK CENTER for 2 kinds of job. Pick one to see what they paid and said.
curtis4 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★
This place failed my mom’s car for blue smoke they said they saw. I myself nor my mom or sister had never seen this blue smoke since. We took the car back and no smoke was present and they still failed her and said they saw blue smoke. I took it to a place in Fairfield and it passed no problem with no smoke present.…
J.Local Guide · 39 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 months ago★★★★★
I bring all my vehicles here for Smog testing. There cost is reasonable and they make every effort to get you in and out.
Pedro7 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 months ago★
Stay away from this clowns, I call in to see if they can help me, they say yes, once I arrived they say they can't because they are too busy. They changed their mine in 10 minutes, just go around the corner there's a better place.
Philip8 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 4 months ago★★★★★
Great place to go for a Smog check. I was in and out within 15min. The lady in the front desk area had great customer service and made it easy to get in and out in a timely manner.
The4 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 4 months ago★★★★★
I’m the type who calls around and hopes to get the best price. My partner, on the other hand, prefers convenience. It’s nice when both concepts come together. That is exactly what happened at SG Smog Vallejo. Omar was efficient, professional, and friendly (like give him a raise, expeditiously!)
The price was $48…
Jessie-Marie3 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 4 months ago★★★★★
Got me in quick and was out in 30 mins. They always have such kind people working there was well!!
Thank you so much for taking the time to leave us a 5-star review for your smog test service! We are thrilled to hear that you had a great experience with us. Our team works hard to provide top-notch service, and we are grateful for your support. If you ever need assistance in the future, please don't hesitate to reach out. Thanks again for choosing us!
Stedson7 reviewsiTotal number of Google reviews Stedson has written across all businesses on Google Maps, not just this one.
Very professional, quick and easy to understand, great service
Response from the owner · a week ago
Thank you so much for taking the time to leave us a 5-star review for your smog test service! We are thrilled to hear that you had a great experience with us. Our team works hard to provide top-notch service, and we are grateful for your support. If you ever need assistance in the future, please don't hesitate to reach out. Thanks again for choosing us!
Joe WiebelhausLocal Guide · 27 reviewsiTotal number of Google reviews Joe has written across all businesses on Google Maps, not just this one.
Fast and friendly smog at 9am on a Sunday! Thank you!!!
Response from the owner · a week ago
Thank you so much for taking the time to leave us a 5-star review for your smog test service! We are thrilled to hear that you had a great experience with us. Our team works hard to provide top-notch service, and we are grateful for your support. If you ever need assistance in the future, please don't hesitate to reach out. Thanks again for choosing us!
curtis lang4 reviewsiTotal number of Google reviews curtis has written across all businesses on Google Maps, not just this one.
This place failed my mom’s car for blue smoke they said they saw. I myself nor my mom or sister had never seen this blue smoke since. We took the car back and no smoke was present and they still failed her and said they saw blue smoke. I took it to a place in Fairfield and it passed no problem with no smoke present. These guys are lazy and didn’t even put the car on the machine the second time. They just failed her. They are not trustworthy. I wouldn’t go here ever again
J. PaceLocal Guide · 39 reviewsiTotal number of Google reviews J. has written across all businesses on Google Maps, not just this one.
Stay away from this clowns, I call in to see if they can help me, they say yes, once I arrived they say they can't because they are too busy. They changed their mine in 10 minutes, just go around the corner there's a better place.
Jonathan MenardLocal Guide · 25 reviewsiTotal number of Google reviews Jonathan has written across all businesses on Google Maps, not just this one.
Thank you so much for taking the time to leave us a 5-star review for your smog test service! We are thrilled to hear that you had a great experience with us. Our team works hard to provide top-notch service, and we are grateful for your support. If you ever need assistance in the future, please don't hesitate to reach out. Thanks again for choosing us!
Philip Camacho8 reviewsiTotal number of Google reviews Philip has written across all businesses on Google Maps, not just this one.
Great place to go for a Smog check. I was in and out within 15min. The lady in the front desk area had great customer service and made it easy to get in and out in a timely manner.
Response from the owner · 4 months ago
Thank you so much for taking the time to leave us a 5-star review for your smog test service! We are thrilled to hear that you had a great experience with us. Our team works hard to provide top-notch service, and we are grateful for your support. If you ever need assistance in the future, please don't hesitate to reach out. Thanks again for choosing us!
The Family Johnson4 reviewsiTotal number of Google reviews The has written across all businesses on Google Maps, not just this one.
I’m the type who calls around and hopes to get the best price. My partner, on the other hand, prefers convenience. It’s nice when both concepts come together. That is exactly what happened at SG Smog Vallejo. Omar was efficient, professional, and friendly (like give him a raise, expeditiously!)
The price was $48 after the coupon and we were in and out with no wait on a Friday morning. Did I mention this is directly across from the Dmv? I just knew there was gonna be a surcharge for this convenience, but once again, they quoted me the best price over the phone and really exceeded my expectations. This will be my to go place from now on! Thanks, Omar.
Response from the owner · 4 months ago
Thank you so much for taking the time to leave us a 5-star review for your smog test service! We are thrilled to hear that you had a great experience with us. Our team works hard to provide top-notch service, and we are grateful for your support. If you ever need assistance in the future, please don't hesitate to reach out. Thanks again for choosing us!
